RODCB/DBI写入SQL Server非默认Schema表遇dbWriteTable功能异常求助

Hey there! Let’s work through your schema-related frustration with dbWriteTable—I’ve run into similar quirks with older DBI versions and SQL Server, so let’s break this down step by step.

First: The Correct Id() Function Usage #

It sounds like your Id() syntax might be off. For SQL Server, you need to explicitly pass both the schema and table arguments to the Id() object, then pass that directly as the name parameter in dbWriteTable. Here’s the proper pattern:

library(DBI)
# Establish your connection (adjust driver/credentials as needed)
conn <- dbConnect(odbc::odbc(),
                  Driver = "SQL Server",
                  Server = "your_server_name",
                  Database = "your_database",
                  UID = "your_username",
                  PWD = "your_password")

# Write/append with schema specified via Id()
dbWriteTable(conn,
             name = Id(schema = "your_schema_name", table = "your_table_name"),
             value = your_data_frame,
             append = TRUE,
             row.names = FALSE) # Always include this to avoid extra columns!

Why dbQuoteIdentifier Might Be Failing #

If you tried using dbQuoteIdentifier directly, the issue is likely that you weren’t combining it with the connection object and Id() properly. While you can use quoted identifiers, Id() is the preferred (and more reliable) method for DBI. If you insist on using dbQuoteIdentifier, here’s the correct way:

# Create a properly quoted schema+table identifier
quoted_table <- dbQuoteIdentifier(conn, Id(schema = "your_schema", table = "your_table"))

# Pass the quoted object to dbWriteTable
dbWriteTable(conn,
             name = quoted_table,
             value = your_data_frame,
             append = TRUE,
             row.names = FALSE)

That said, older DBI versions (like 0.7-15) have spotty support for quoted identifiers with SQL Server, so stick to Id() if you can.

What’s Up with append=TRUE? #

append=TRUE only works if the table already exists in the specified schema with a matching structure. If you’re getting errors here, check these two things:

• Verify the table exists in your target schema using dbExistsTable(conn, Id(schema = "your_schema", table = "your_table")). If it returns FALSE, you’ll need to create the table first (set append=FALSE once) before appending.
• Ensure your data frame’s column names and data types exactly match the existing table’s schema. SQL Server is strict about type matching—even minor discrepancies (like integer vs numeric) will throw errors.

A Note on Version Limitations #

DBI 0.7-15 is pretty outdated (released in 2018), and its support for SQL Server schemas is limited compared to newer versions. If possible, try upgrading to a more recent stable version of DBI (1.1.x or later) and the odbc package (1.3.x or later). Just keep in mind that SQL Server 2012 is also end-of-life, so you’ll want to use an ODBC driver that still supports it (like ODBC Driver 11 for SQL Server).

内容的提问来源于stack exchange，提问作者spillway18